My Wheels are rubbing my sway bars..any suggestions???

Are the rims rubbing? Or the tires? Either the wheels are too wide, the tires are too wide (if tire is rubbing) or those rims have to steep of an offset. I had this problem (tires rubbing sway bar and leaving a polished spot) when I had 07 GT wheels on my 96. The problem was the wheel offset. If those Bullitts were made for 05 and up Mustangs, then you have an offset issue. If it is not an offset issue and the rims are rubbing, then it is most like too wide of a rim. It is probably just a rim width issue. If you decide to use spacers, don't use plate spacers. I used those and it leaves very little stud to attach the lug nuts. Since the rims may be very wide, using spacers may cause a rubbing issue in the fender wells.